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INA239 데이터시트(PDF) 22 Page - Texas Instruments

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부품명 INA239
상세설명  INA239 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
PDF  44 Pages
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Table 7-6. ADC_CONFIG Register Field Descriptions (continued)
Bit
Field
Type
Reset
Description
2-0
AVG
R/W
0h
Selects ADC sample averaging count. The averaging setting applies
to all active inputs.
When >0h, the output registers are updated after the averaging has
completed.
0h = 1
1h = 4
2h = 16
3h = 64
4h = 128
5h = 256
6h = 512
7h = 1024
7.6.1.3 Shunt Calibration (SHUNT_CAL) Register (Address = 2h) [reset = 1000h]
The SHUNT_CAL register is shown in Table 7-7.
Return to the Summary Table.
Table 7-7. SHUNT_CAL Register Field Descriptions
Bit
Field
Type
Reset
Description
15
RESERVED
R
0h
Reserved. Always reads 0.
14-0
CURRLSB
R/W
1000h
The register provides the device with a conversion constant value
that represents shunt resistance used to calculate current value in
Amperes.
This also sets the resolution for the CURRENT register.
Value calculation under Section 8.1.2.
7.6.1.4 Shunt Voltage Measurement (VSHUNT) Register (Address = 4h) [reset = 0h]
The VSHUNT register is shown in Table 7-8.
Return to the Summary Table.
Table 7-8. VSHUNT Register Field Descriptions
Bit
Field
Type
Reset
Description
15-0
VSHUNT
R
0h
Differential voltage measured across the shunt output. Two's
complement value.
Conversion factor:
5 µV/LSB when ADCRANGE = 0
1.25 µV/LSB when ADCRANGE = 1
7.6.1.5 Bus Voltage Measurement (VBUS) Register (Address = 5h) [reset = 0h]
The VBUS register is shown in Table 7-9.
Return to the Summary Table.
Table 7-9. VBUS Register Field Descriptions
Bit
Field
Type
Reset
Description
15-0
VBUS
R
0h
Bus voltage output. Two's complement value, however always
positive.
Conversion factor: 3.125 mV/LSB
INA239
SLYS027 – JANUARY 2021
www.ti.com
22
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